Per subject; if autoport is in use for a host, the current
virDomainGraphicsDefFormat code always emits "port=-1", even if a port
is assigned to the host; this leaves no way for a client to find the VNC
port assigned to the host in question.
This patches fixes it by putting the vncport in place if there is one, and
only putting "-1" if we fail that test.
* src/domain_conf.[ch] src/openvz_conf.[ch] src/openvz_driver.c:
patch from Evgeniy Sokolov doing the OpenVZ xml refactoring,
still needs to be ported to the new XML parsing code but
implements the new format.
Daniel
